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Northwest Passage

Definition:

Sea passage between the Atlantic and Pacific oceans along the northern coast of North America.

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As a modern trade route it has been only marginally useful, because of the difficulties in navigating around the polar ice cap and the giant icebergs in the Atlantic between Greenland and Baffin Island and in the Pacific in the Bering Strait.

The U.S. and Canadian governments have tried to encourage international commerce in the passage, noting how much it would shorten many international shipping distances. However, the cost of strengthening ships against ice and potentially high insurance rates for vessels used in Arctic service have been factors inhibiting the development of the Northwest Passage as a trade route.

Source: Britannica Concise Northwest Passage 

Northwest Passage
One of the possible ways through the Northwest Passage
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